Question

For which body the following variation of E with r is observed?

(a) Line of charge

(b) Sheet of charge

(c) Solid Sphere

(d) Spherical Shell

The question was posed to me during an online interview.

I want to ask this question from Maxwell’s Equations topic in division Electrodynamics of Engineering Physics II

Answer 1

Right option is (d) Spherical Shell

To explain: The given variation of E with r is for a spherical sell. As we know, in a shell, all the charges are present on the surface and no charges are present on the cavity. Thus, the electric field inside is zero and outside it decreases.